Fourth to william harry freeman



Sept. 20,

M. J. HAFFEY EAR TESTING DEVICE Filed sept. 4, 1925 2 Sheets-Sheet 1 Z z 5 f4 /5 3 2 m" /3 i Z6 V 9/ ,/9 /f i V Y? \l\\\\ iig:

Sept. 20, 1927.

' 1,642,923 M. J. HAFFEY EAR TESTING DEVICE Filed sept, 4, 1925 Y 2 Sheets-Sleet 2 EFF-"f5 E.'

zzmzzfar Mii/25ml@ fir/f a spring Patented Sept. 20, 1927.

PArnjNr orrice.

MATTI-IEW JOSEPH HAFFEY, OF TORONTO, ONTARIO, CANADA, ASSIGNOR OF ONE- FOU'RTH TO WILLIAM HARRY FREEMAN, OF TORONTO, CANADA.

EAR-TESTING DEVICE.

Applicatin led september 4, 1925. serial 110.54510.

My invention relates to improvements in ear testing devices, and the object of the invention is to provide a device by which the hearing of a person may' be tested both as to the pitch, timbre, time and force of a sound which his hearing is able to detect, and in which the pitch, timbre, time andforce always remain constant,'and it consists essentially of the arrangement and construction of parts as hereinafter more particularlyexplaine'd. f y

Fig. 1 is a front elevation of my device.

Fig; 2 is a. cross sectional view taken on line 2-2 Figure 1. w

Fig. 3 is a sectional view' on line 3-3 Figure 1.

Fig. 4 is a sectional planfview.4

Fig. 5 is a detail of the adjustable link connection 20".

Fig. 6 is an enlarged detail view showing the means for supporting'the graduated arm 32. i

In the drawings like characters of reference indicate corresponding parts in' each figure. Y

1 indicates the main casing'which'is preferably provided with a hinge front 2.v

3 is a bellows pneumatic, the top wall' 4 of which forms the top wall of the casing when the bellows is collapsed,.the front 2' being connected 'to the front edge of the wall 44 by any suitable means therebyforming a container for my mechanism.

5 is a wind chest provided with reed openings 6 in which are located metal reeds 7.

6 is a reed chamber, a reed chamber be"- ing located under each reed. kThe front of each reed chamber is provided withan open mouth 9 through whichithe sound is emitted.

10 are a series of closures, the'closure 10 being hingedly mounted. as indicated at 11 above each mouth 9 and when in the vertical position forms a' closure for such mouth', being held in the closed position by means of finger 12, a sprin-g finger 12 being provided for each closure 10. y

13 is a knob or other means by which the closure may be manually raisedso as to open the mouth 9.` j f 14 is a chamber which is formed in the wind chest 5 and provided with a rectangular opening 15 formed inthe bottom wall of the wind chest 5 Within'the chamber 14.

16 isv a slitopening formedin that-'portion of the bottom wall 4 of the bellows 3 which forms the top of the chamber 14.

17 is a valve hingedly connected to the wall 4X at 18, the valve 17 being adapted ta' be swung in and out of the covering position over the slitorifice 16.

19 is an arm rigidly extending from the valve 17.

20 is a supplemental pneumatic carried by the lower wall of the wind chest 5 so as to extend over the orifice 15. 4

20Sis a link pivotally connected at its upper end to thearm 19 and connected at its lower end to an adjustable screw pin 21preferably by forming a head 22 at the upper end of the pin with which the members of the link 2()X are clamped into engagement by aI screw 23, such members being provided with small orifices 24 into which the side portions of the head 22 fit.

25 isA aweight carried by an arm 26 secured to the lower wall of the pneumatic 20. 27 is a bar which is secured to the bottom wall of the vcasing so as to slide longitudinally preferably by means of a stud or screw 23X extending through` a slot 28 formed in the bar. Y

29 is a bracket carried by the bar 27 intermediately ofV itslength. The outer end of the bar 27 is provided with an upturned end 27". y 30 is a lever pivotally mounted upon the bracket 29 as indicated at 3-1. 32 is a graduated arm preferably graduated to milime tres -o-f. water pressure provided with an orifice 33 across which extends a metal plate 34 provided with a V-notch 35 Vinto which fits a knife edge 36 extending outward from the extensionv 27 X.'

`37 isa link pivotally connected to the short end of the lever arm 32 vand at its low-er end 'to the outer lend of the lever 30. The lever is provided at its inner end lwith a longitudinal slot 38 into which eX- tends a pin39 carried by the lower wall `of the pneumatic 20. j l

`'40' is an adjustable weight secured to the lever 30 by means of a set screw 41.

42 is a weight carried by the lever arm 32 so as to be slidable longitudinally thereof, the weight 42 being provided withv al finger gripportion 42X and a pointer 43 coacting with the graduations of the lever arm 32.

Having'. described the principal parts in- The'movable wall 4 of the bellows 3 is first manually depressed and then permitted to expand freely due to the pressure of the spring and tending to draw air through the orilice 16. In order to hold the valve 17 1n an adjusted partially open position the weight 42 is adjusted upon the arm 32 in order to more orless depress the same from the dotted position shown in Figure 1. It will or' course be understood that the farther l the `distance the weight 42 is moved from the fulcrum ol the lever arm formed by the knife edge 35, the greater will be the depression of the long end of the lever thereby operating the short end of the leve-r to a greater or less extent to adjust the posit-ion ofthe pneumatic 2O and thereby opening the valve 1,7 to a more or less extent. l

Vhen thev valve 17 is opened as above described, the air passes through the mouth 9 into the reed chamber and through the reeds l 7 into the wind chest 5 and from thence into the chamber 14 and through the orice 16 into the bellows 3 thereby causing the note to speak.

In order to vary the intensity or volume of the note to test the loudness which ay person is able to hear, the weight 42 is adjusted upon-'the lever arm 32 thereby more orless depressing such arm at its free end and operating the leverBO to a greater or less extent-to adjust the position of the pneumatic 2O and through the link 20x and arm 1.9, adjust the position of the valve 17 to a more open position thereby permitting a greater volume of air to pass through the opening 16 increasing the volume of the notes sounded by the air passing through the reed of the open valve chamber.

Y The patient is placed :tour metres from the instrument; the ear to be tested turned towards it and the other ear closed. The valve or closure 10 at the left hand side corresponding to low C (thirty-two vibrations per second) is sounded by depressing the bellows 3 for one second. The weight on the scale is placed at ten millimetres. If the patients hearing is normal he will hear a note which is barely perceptible. It this is not heard the weight is moved along the scale increasing the loudness until the sound is heard. It the C or -low C used is imperceptible the next closure vibrations per second), the C1 (sixty-four vibrations per second) the C2 (one hundred and twenty-eight vibrations per second) and the C3 (two hundred and titty-six vibrations per second) are tried until an audible note is reached. In'this way the force of tone is accurately measured and the degree of dullness of hearing is linely calculated.

From this description it will be seen that I have devised a. very simple device which will enable the hearing oi' a patient to be tested both as to the pitch of a sound which he is able to hear and also the volume of a. sound which he is able toy hear.V

What I claim as my invention is:

1. An ear testing device comprising a main casing, a bellows supported in the casing, a wind chest having an air outlet communicating with the interior of the bellows and having a series of air inlets, a reed chamber having a sound emitting mouth leading from each inlet, a reed so positioned in each reed chamber that the air passes therethrough to the windchest, a removable closure for each mouth, and means for controlling the volume of air passing from the wind chest to the bellows to weigh the volume of tone as the air passes through the reeds.

2. An ear testing device comprising a main casing, a bellows supported in the casing, a wind chest having an air inlet communicating with the interior of the bellows and having a series of air outlets, a` reed chamber for each outlet having a sound emitting mouth connected with each outlet, a reed so positioned in each outlet that t-he air passes therethrough into the reed chamber to pass through the mouth thereof, a removable closure for each mouth, a valve for controlling the ypassage of air through the inlet to the wind chest from the bellows, and graduated means for controlling the position of the valve.

V3. An ear testing device comprising .a main casing, a bellows supported in the casing, a wind chest having an air inlet communicating with the interior of the bellows and having a series of air outlets, a reed chamber having a sound emitting mouth connected with each outlet, a reed so positioned in the outlet that the air passes therethrough into the reed chamber to pass through the mouth thereof, a removable closure for each mouth, al valve for controlling the passage of air through the vinlet to the wind chest from the bellows, a lever arm fulcrumed in proximity to one end and suitably graduated, a weight adjustably mounted to move longitudinally of the lever arm to any of the graduated positions, and mechm anism actuated by the opposite end of the lever arm for opening and closing the valve.

4. An ear testing device comprising a main casing, a bellows supported in the casing, a wind chest having an air inlet communicatin with the interior of the bellows, and a series of air outlets, a reed chamber having a sound emitting mouth connected with each outlet, a reed so positioned in the outlet that the air passes therethrough into the reed chamber to pass through the mouth thereof, a removable closurefor each mouth, a valve for contro-lling the passage of air through the inlet to the wind chest from the bellows, a lever arm fulcrumed in proximity to one end and suitably graduated, a weight adjustably mounted to move longitudinally of the lever arm to any of the graduated positions, a lever pivoted intermediately of its length in the main casing at right angles to the aforesaid lever armi, a link connection between one end of Such lever rand the short end of the lever arm, and connecting actuating means between the opposite end of the lever and the valve.

5. An ear testing V'device .bomprising a main casing, a Ibellows supported in the casing, a wind chest having an air inlet communicating with the interior of the bellows and having a series of air outlets, a reed chamber having a sound emitting mouth connected with each outlet, a reed so positioned in the outlet that the vair passes therethrough into the reed chamber to pass through the mouth thereof, a removable closure for each mouth, a valve for controlling the passage of air through the inlet to the wind chest from the bellows, a lever arm fulcrumed in proximity to one end and suitably graduated, a weight adjust-ably mounted to move longitudinally of the lever arm to any of the graduated positions, a Ilever pivoted intermediately of'its length in the main casing at right angles to the raforesaid lever arm, a link connection between one end of such lever and the short end of th`e lever arm, a pneumatic carried by the wind chest and communicating with the interior of the wind chest, an arm extending from the valve, and a link connection between the. outer end of the arm and the movable wall of the pneumatic.

MATTHEW JOSEPH HAFFEY. 

